Condenser fan not working

Replaced the old capacitor, which tested well below spec. Fan started up and ran for a few days before again failing to start spinning. (compressor working properly this entire time). Replaced fan motor. New fan started up and ran for a few days before again failing to start. I've ordered a new contactor.

Questions:
1) Can the contactor prevent the fan from starting while allowing the compressor to start?

2) Any ideas on next steps? I assume that I have power reaching the unit as it starts up, albeit intermittently. Also assuming low voltage is ok as well since it's activating compressor.

thanks for any suggestions.